Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea997b2a0f98cbc…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 21:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6da0588c6eab549006f8a331c39b9abe SHA-1: 1990b53561f0251240e23a56026c6e834fdbfaec SHA-256: eea997b2a0f98cbc4dd988508c3740d1150142f7fe2c5d53eb602000a9ffb672
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. While no scripts were extracted, the structure and URL patterns suggest this document is intended to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://virtualpulse.eu/UserFiles/file/27737521975.pdf In PDF document text
    • http://planetamama.ru/files/file/nazebasis.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/44571496040.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dn9ree8rdj8l09a8eavrtv34i8/17226329065.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a893b1b9a8e---sazodikizereratu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa342b349d---xojadewoxaretotigowurik.pdfIn PDF document text
    • http://fittbike.hu/files/file/83598191094.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1a4e22c1---10444656302.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2lk45ebqd3k15bagj885ve89sq/92400089098.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/17925844718.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/87887540467.pdfIn PDF document text
    • http://cuacuondaiphuc.vn/upload/files/dugapafijugamekoxo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3b2d082086359c21faa1f8ab8d7ff80/vikifizolejusizazu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cac8c875---71568062029.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/77378690394.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/tesupemodukupifolefifaviw.pdfIn PDF document text
    • http://allycatering.com/userfiles/61120541409.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d08bc1a4462c2d4ead2da0c4678c0d11/jimiwosivu.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021081622501173499.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a4b214d7---42693741597.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/zigadas.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/1006274421.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160763c87b7b33---99228189385.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24e8b31e22---simavojitavad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=paris+de+cerca+lonely+planet+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 10728 bytes
SHA-256: 37a114059a80570d6aa14379f34c2df103493ea2d0c6f2211834fc053e951aa9
font_02_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 17540 bytes
SHA-256: 5f431ec8e8a50c67fc66947a3f60fff9492f1fe388da41970a9258193bce6c92

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